152 



APPENDIX. 

 Hence the height of A above C is - 58,7 feet ; 



Height of the mountain above C 1498,5 feet : 



+ height of C above water's edge - 5 ; 



Height of mountain above the level of the fea 1503,5 feet; 

 which differs from that found by the fingle angle three 

 tenths of a foot. 



I cannot account for the great difference between the 

 geometrical meafure and the barometrical one according 

 to M. De Luc's calculation, which amounts to 84,7 feet. 

 I have no reafon to doubt the accuracy of Dr. Irving's ob- 

 fervations, which were taken with great care. As to the 

 geometrical meafure, the agreement of fo many triangles, 

 each of which muft have deteded even the fmallefT error. 

 Is the moft fatisfaftory proof of its corrednefs. Since my 

 return, I have tried both the theodolite and barometer, 

 to difcover whether there was any fault in either, and find 

 them upon trial, as I had always done before, very 

 accurate. 



Observations 



